1 /*
2  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 
25 package org.graalvm.compiler.lir.sparc;
26 
27 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
28 import org.graalvm.compiler.lir.LIRInstruction;
29 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
30 
31 /**
32  * This interface is used for {@link LIRInstruction}s which provide a delay slot for one instruction
33  * from another {@link LIRInstruction}.
34  *
35  * @see SPARCTailDelayedLIRInstruction
36  */
37 public interface SPARCDelayedControlTransfer {
38 
39     SPARCDelayedControlTransfer DUMMY = new SPARCDelayedControlTransfer() {
40         @Override
41         public void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
42             // do nothing
43         }
44 
45         @Override
46         public String toString() {
47             return "null";
48         }
49 
50         @Override
51         public void resetState() {
52         }
53     };
54 
55     /**
56      * This method must be called, to generate the control transfer, but without any Nop in the
57      * delay slot.
58      *
59      * @param crb
60      * @param masm
61      */
emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm)62     void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm);
63 
resetState()64     void resetState();
65 }
66